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參數(shù)資料
| 型號(hào)： | LP2951ACM |
| 廠商： | Semtech Corporation |
| 英文描述： | 150mA ADJUSTABLE VOLTAGE REGULATOR |
| 中文描述： | 150mA的可調(diào)電壓調(diào)節(jié)器 |
| 文件頁(yè)數(shù)： | 4/5頁(yè) |
| 文件大?。?/td> | 112K |
| 代理商： | LP2951ACM |
LP2951A
1998 SEMTECH CORP.
150mA ADJUSTABLE
VOLTAGE REGULATOR
March 17, 1998
652 MITCHELL ROAD NEWBURY PARK CA 91320
4
PRINCIPLES OF OPERATION (LP2951 and LP2951A) (cont.)
Reducing Output Noise
In ultra-quiet systems, or when the LP2951(A) is being
used as a reference, it may be desirable to perform
additional output filtering to reduce noise. While this
can be done simply using larger capacitors on the out-
put, that solution tends to be bulky and expensive, and
eventually, with huge capacitors (>1,000F) may cause
instability in the regulator. Generally, it is more cost-
effective to let the regulator regulate output noise
away. This can be done by bypassing the upper resis-
tor in the feedback divider with a small capacitor to
provide a more direct path for AC feedback. The size
of this capacitor can be calculated from the formula:
C
BYPASS =
where R1 is the upper resistor of the feedback divider
and f
corner is the frequency above which the increased
AC feedback is to become active. Because the gain of
the error amplifier in the LP2951(A) begins to roll off at
about 300 Hz, this is generally an optimum choice for
corner frequency.
The reduction of the output noise will be proportional to
the ratio of the two resistors in the feedback divider,
and will increase 20 dB per decade at frequencies
above the corner frequency chosen, up to the fre-
quency where the error amplifier’s gain has rolled off to
1 (
≈100KHz). In order to maintain regulator stability
when using a noise-reducing bypass capacitor, it will
also be necessary to increase the size of the output
filter capacitor by the ratio
2
R
1
R
1
R
+
2
R
1
R
1
R
+
corner
1f
R
2
1
π
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LP2951A | 150mA Adjustable Voltage Regulators(低壓差，5V固定輸出或可調(diào)輸出(1.24-29V)，150mA穩(wěn)壓器) |
| LP2951CS-L-3.3 | FIXED/ADJUSTABLE POSITIVE LDO REGULATOR, 0.45 V DROPOUT, PDSO8 |
| LP2951CS-L-5.0 | FIXED/ADJUSTABLE POSITIVE LDO REGULATOR, 0.45 V DROPOUT, PDSO8 |
| LP2985AITPX-2.8/NOPB | 2.8 V FIXED POSITIVE LDO REGULATOR, 0.575 V DROPOUT, PBGA5 |
| LP2985ITPX-2.8/NOPB | 2.8 V FIXED POSITIVE LDO REGULATOR, 0.575 V DROPOUT, PBGA5 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP2951ACM | 制造商:Texas Instruments 功能描述:V REG LDO ADJ +1.24/29V SMD 2951 |
| LP2951ACM | 制造商:Texas Instruments 功能描述:IC, ADJ LDO REG 1.24V TO 29V 0.1A 8-SOIC |
| LP2951ACM.TR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| LP2951ACM/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO SERIES OF ADJUSTABLE MICROPOWER VLTG REGS RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2951ACM3.0 | 制造商:National Semiconductor 功能描述:LDO Regulator Pos 3V 0.1A 8-Pin SOIC N Rail |
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